async Task Nav()
{
if (i < 0)
{
i = 0;
}
ComicImage.Source = await StorageInterface.GetImageSourceFromStorageFile(arr[i++]);
if (i == arr.Length)
{
i = 0;
halted = true;
PauseButton.Content = "ENDE. Neu starten?";
PauseButton.Background = new SolidColorBrush(Colors.Red);
}
}